In what officials describe as an "unusual incident," wheels on a Valley Transportation Authority light rail train went off the tracks early this morning in downtown San Jose.

None of the six passengers riding on the southbound train were injured, according to VTA spokeswoman Brandi Childress.

The train was heading south on the Alum Rock/Santa Teresa line went it went off the tracks just north of the Children's Discovery Museum platform at about 2 a.m., Childress said. Because it was the last passenger train of the night, there were no impacts to service.

VTA officials sent a relay train to pick up the stranded six passengers and take them to their stations.

VTA workers needed about 21/2 hours to get the train back on track and towed to the yard.

Today crews are checking the rails where the train went off the tracks and making minor repairs. Crews are also checking out the train to try and determine why the derailment occurred.